package com.itheima.student.system04.entry;

import com.itheima.student.system04.domain.Student;

import java.util.ArrayList;
import java.util.Scanner;

/*

学生对象  使用无参构造
将录入的信息封装成方法

 */
public class StudentEntry {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        ArrayList<Student> list = new ArrayList<>();
       loop: while (true) {
            System.out.println("--------欢迎使用学生管理系统--------");
            System.out.println("1.添加学生");
            System.out.println("2.删除学生");
            System.out.println("3.修改学生");
            System.out.println("4.查看学生");
            System.out.println("5.退出");
            System.out.println("请输入你的选择:");
            String choice = sc.next();
            switch (choice) {
                case "1":
                    addStudent(list);
                    break;
                case "2":
                    deleteStudent(list);
                    break;
                case "3":
                    updateStudent(list);
                    break;
                case "4":
                    findStudent(list);
                    break;
                case "5":
                    System.out.println("谢谢您的使用!");
                    break   loop;
                default:
                    System.out.println("您的输入有误,请重新输入:");
                    break;

            }
        }
    }
        // 查看学生
    public static void findStudent(ArrayList<Student> list) {
            if (list.size()==0){
                System.out.println("该系统中没有学生信息!");
            }
        System.out.println("学号"+"\t"+"姓名"+"\t"+"年龄"+"\t"+"性别"+"\t"+"生日");
        for (int i = 0; i < list.size(); i++) {
            // list.get(i)
            Student student = list.get(i);
            System.out.println(student.getSid()+"\t"+student.getName()+"\t"+student.getAge()+"\t"+student.getGender()+"\t"+student.getBirthday());

        }
    }

    //  修改学生
    public static void updateStudent(ArrayList<Student> list) {
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入你要修改的学生的学号:");
        String sid =null;
        int index=-1;
        while (true) {
            sid = sc.next();
            //  判断录入的学号系统中是否已经存在
            index = getIndex(sid, list);
            if (index>=0){
                System.out.println("此学号系统中已有,您可以修改其信息:");
                Student student = getStudent(sc, sid);
                list.set(index,student);
                System.out.println("该学生信息已修改!");
                break;

            }else{
                System.out.println("系统没有该学生信息,无法修改!");
                break;
            }
        }





    }

    //  删除学生
    public static void deleteStudent(ArrayList<Student> list) {
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入你要删除的学生的学号:");
        String sid = sc.next();
        int index = getIndex(sid, list);
        if (index>=0){
            list.remove(index);
            System.out.println("删除成功!");
        }else{
            System.out.println("该学生不在系统中,无需删除!");
        }

    }

    //  添加学生
    public static void addStudent(ArrayList<Student> list) {
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入你要添加的学生的学号:");
        String sid =null;
        while (true) {
             sid = sc.next();
            //  判断录入的学号系统中是否已经存在
            int index = getIndex(sid, list);
            if (index>=0){
                System.out.println("此学号系统中已有,请重新录入:");

            }else{
                System.out.println("请继续下一程序:");
                break;
            }
        }
        Student student = getStudent(sc, sid);

        list.add(student);
        System.out.println("该学生信息已录入系统!");

    }

    public static Student getStudent(Scanner sc, String sid) {
        System.out.println("请输入你要添加的学生的姓名:");

        String name = sc.next();
        System.out.println("请输入你要添加的学生的年龄:");
        int age = sc.nextInt();
        System.out.println("请输入你要添加的学生的性别:");
        String gender = sc.next();
        System.out.println("请输入你要添加的学生的生日:");
        String birthday = sc.next();
        Student student = new Student();
        student.setSid(sid);
        student.setName(name);
        student.setAge(age);
        student.setGender(gender);
        student.setBirthday(birthday);
        return student;
    }


    //  判断该系统中是否有没有此学号
    //  参数  输入的学号sid    已有的集合  ArrayList<Student> list
    //  返回值 index
    public static int getIndex(String sid, ArrayList<Student> list){
        for (int i = 0; i < list.size(); i++) {
                //        list.get(i)
            Student student = list.get(i);
            if (student.getSid().equals(sid)){
                return i;
            }

        }
        return -1;
    }
}
